feat(rofi): real icons, zebra rows, content-fit menus across all themes

Reworked the menu look, palette-driven so it lands on every theme:

  - Real Papirus icons in place of Nerd Font glyphs: a row() helper emits
    rofi's per-row icon protocol, and the five static menus (root, Tools,
    System, Power, Capture) map each entry to a freedesktop icon name
    (verified present in Papirus). Entry text is now clean ("Apps"), the
    case-matching is unchanged.
  - Larger icons via a new t.ui.iconSize knob (36px, generated theme); the
    summer whole-swaps keep their 40px identity.
  - Rounded, roomy rows with subtle zebra striping: alternate rows lift to
    @surface (a faint bg0 wash on the summer cream/slate windows), the
    selected row to @accent — using rofi's normal/alternate/selected row
    parities.
  - Content-fit windows: fixed-num-lines=false so a 6-entry menu stops
    reserving 8 rows of empty space (the launcher still fills + scrolls).
    Dropped the fixed height:50% from the summer .rasi so they size to
    content too — which also unhid their clipped Power/Keybindings rows.
  - Title-cased the menu prompts.

Verified by building the HM config and rendering the generated theme plus
both summer whole-swaps headlessly (sway + grim): icons resolve, zebra
shows, every menu hugs its rows.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

themes/summer-day/rofi.rasi

@@ -29,7 +29,8 @@ window {
     border-color: @yellow;
     border-radius: 15px;
     width: 40%;
-    height: 50%;
+    /* No fixed height — size to content (fixed-num-lines:false) so every
+     * entry shows without scrolling and there's no empty space below. */
     location: center;
     anchor: center;
     x-offset: 0;
@@ -90,6 +91,12 @@ element {
     spacing: 15px;
 }
 
+/* Zebra striping: every other row lifts with a faint light wash over the
+ * dark window (bg0 at ~12% alpha). The selected row below still wins. */
+element alternate.normal {
+    background-color: #fdf6e31f;
+}
+
 element-icon {
     background-color: transparent;
     text-color: inherit;